FIN_WAIT_2

[Robert Gogolok]

Hi!

I have many (about 100) connections in FIN_WAIT_2 state on my webserver
(FreeBSD 5.3, apache 2.5.53).

I discussed a few questions already on the freebsd-questions list, see
http://lists.freebsd.org/pipermail/freebsd-questions/2005-March/081580.html



Some connections doesn't seem to go away (they remain in FIN_WAIT_2
state) after 2 hours, what is the exact timeout?


I can see every 5 minutes ACK packages sent from that FIN_WAIT_2
connections. Is these because of tcp keep alive (or which RFC specifies
that behaviour)?
tcpdump output:
16:04:12.987415 IP HTTP_SERVER.http > HTTP_CLIENT.10228: . ack
1760359226 win 0
16:04:12.987678 IP HTTP_SERVER.http > HTTP_CLIENT.10228: . ack
1760359226 win 32900
16:08:57.944008 IP HTTP_SERVER.http > HTTP_CLIENT.10228: . ack
1760359226 win 0
16:08:57.944300 IP HTTP_SERVER.http > HTTP_CLIENT.10228: . ack
1760359226 win 32900
...


Greetings,
Robert